sd: wait longer for initialization

Author: NickeZ

CHANGELOG.md

@@ -1,7 +1,7 @@
 # Changelog
 
 ## [Unreleased]
--
+- Attempt to fix flaky SD behavior
 
 ## 9.5.0 [released 2021-03-10]
 - RestoreFrommnemonic: ported to Rust. Will now return UserAbortError on user abort instead of GenericError.

src/sd.c

@@ -380,7 +380,17 @@ bool sd_card_inserted(void)
 #else
     sd_mmc_err_t err = sd_mmc_check(0);
     sd_mmc_pause_clock();
-    return (err == SD_MMC_OK || err == SD_MMC_INIT_ONGOING);
+    /* If initialization is ongoing, wait up to 1 second for it to initialize */
+    if (err == SD_MMC_INIT_ONGOING) {
+        for (int i = 0; i < 10; ++i) {
+            delay_ms(100);
+            err = sd_mmc_check(0);
+            if (err != SD_MMC_INIT_ONGOING) {
+                break;
+            }
+        }
+    }
+    return err == SD_MMC_OK;
 #endif
 }